Google Users Can Block Search Results to Cut Spam

Google March 10 added another Website blocking tool to let users manage domains they dislike or find offensive, part of the search engine's effort to curb spam on Google.com.

Google March 10 added a new tool to let users block Websites they don't like
when searching on Google.com, part of the company's evolving push to give its 1
billion-plus searchers more control over their user experience.
The search engine is now showing an option next to the cached feature in search results
to let users block a particular domain in the future.

When a user clicks to hide those results, they'll get a confirmation message
saying it will not show results from the domain again.

The next time a user searches and a blocked page would have appeared, users
will see a message notifying them that the results have been blocked at the top
or bottom of the results page, with location based on the relevance of the
blocked pages.
Websites that users block are connected with their Google Account, which
means users must sign in before they can confirm a block. Google has added an
"undo" button in case users change their minds after blocking a
domain.
Users may view and manage a list of their blocked Websites in a new settings
page, which they can access by clicking on the "Manage blocked sites"
link that appears when they block a domain, or in search settings.
The new feature is rolling out now on Google.com in English for people using
Chrome 9+, Internet Explore 8+ and Firefox 3.5+, though Google will be
expanding to new regions, languages and browsers.
This personalized search editor of sorts should come in handy for offensive
Websites such as porn domains, or results from content farms and other
low-quality content.
The option is also the latest in a string of moves Google has made to block
unsavory or unwanted content, part of the company's move to cut down on search
spam.
Google Feb. 24 initiated an algorithm change that pushes down low-quality
Websites in its search engine.
A couple weeks before that, Google launched what is ostensibly a precursor to this new block
domain tool with Personal Blocklist Chrome extension, which lets users click
the "block url" button to block a site so they won't see results from
that domain again in their search results on Google.com.
Just as with the Blocklist extension, Google said it's not currently using
the domains people block with its new Website blocker as a signal in ranking.
However, it has left the door open to the possibility of improving search
results in the future.